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20100901
20100901
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and reward stem involves several different brain regions that communicate using chemical signals called neurotransmitters. the this circuit helps us to repeat the behaviors that make us happy while avoiding those that make us miserable. but as any adult knows, pleasure is not always good for you. tonight we'll also explore particularly dangerous forms of pleasure-seeking, addiction. long considered to be a moral weakness, addiction is now understood to be a biological disease. finally, we will explore the role that emotions play in decision-making and social interaction. next month, in part two of the emotional brain, we will turn our focus to negative emotions such as fear and anxiety. joining us tonight, a group of scientists who have devoted their lives to understanding the emotional brain. daniel salzman, he studies how the brain assigns an emotional value to the information that it receives from the five senses. he is an assistant professor of sky tri and neuroscience at columbia university. wolfram schultz. he studies how the brain's reward systemsffect decision-making and learnin
. new rules on child sex abuse, and the u.s. formally ends operations in iraq. chancellor angela merkel fears east german braverynd th country's unification set an example for the world, marking the moment that the treaty was signed two decades ago, she praised the role of civil rights activists and those who escaped the regime. the german leader grew up in the east and says it is now germany's responsibility to fight globally for freedom. >> the original unification treaty was presented to today's chancellor to commemorate its signing in the same room 20 years ago. angela merkel, who grow up in east germany, was joined ere byany politicns iolved in the deal. the interior met -- for the then interim minister, signing the treaty was the high point of his career. >> we left the room together for a moment, and then we simply cried because we were moved, exhausted, and overjoyed. >> it took just 23 minutes to end four decades of communist east german rule. unification had previously been approved by east germany's parliament. chancellor merkel was present at the proedings 20 years ago. she
. president obama addresses the nation as the u.s. combat mission ends in iraq. >> woodruff: and i'm judy woodruff. on the newshour tonight, we get the analysis of mark shields and david brooks. >> lehrer: and margaret warner in baghdad examines the challenges iraqis still face in their daily lives. >> woodruff: then, from mexico city, we learn the latest on the arrest of an alleged drug lord from jason beaubien of npr. >> lerher: we have another in john merrow's reports on the washington, d.c., schools. tonight he looks at a new test for teachers. >> how can you possibly have a system where the vast majority of adults are running around thinking i'm doing an excellent job when what 're producing for kids is 8% success. >> woodruff: and jeffrey brown updates the story of new orleans musician and scholar michael white, five years after katrina. >> i went through a serious period of depression, of anger, of many different kinds of emotions. and then i came to realize the most valuable thing that i have i never lost. it's inside. it's that music tradition. >> lehrer: that's all ahead on toni
-lava cartel. one of them died in a hail of gunfire last december as mexican authorities closed in on him. u.s. authorities had put a $2 million bounty on valdez. there was no word on whether he would be extradited. for more on the arrest, we're joined by national public radio's jason beaubien in mexico city. jason, thank you for talking with us. first of all, they caught him alive. how significant is that? >> it is very significant because obviously he can be important in terms of other investigations, in terms of digging in to the workings of these cartels. yes, it's very important that they caught him alive. and the hope is that they will be able to get more information about the functioning of other cells, other parts of the organization that had splintered after the one man was gunned down by the mexican marines in december of 2009. >> woodruff: how big a victory is this for the mexican government? >> this is really huge in terms of the timing. for president calderon, he really needed a good-news story at the moment. last week you had the worst massacre in the entire drug car with 72 migr
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